Why isn't my machine turning on? The unit may not turn on due to the power source the unit is being plugged into. Double check the power source to see if it's working by placing another appliance into the connection. Make certain you switch the AC/DC switch to its proper setting to turn on the unit. Related articles Why is my machine constantly running? Can I run the unit for a long period of time? Why isn't any air coming out of the High Volume hose? Why does the SPX series motor not start? Wood Chipper